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kbuild: Fix instrumentation removal breakage on avr32
[wrt350n-kernel.git] / drivers / net / rionet.c
blobe7fd08adbbacbfe307d81a47623cf5d627b7053b
1 /*
2 * rionet - Ethernet driver over RapidIO messaging services
3 *
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/delay.h>
17 #include <linux/rio.h>
18 #include <linux/rio_drv.h>
19 #include <linux/rio_ids.h>
20
21 #include <linux/netdevice.h>
22 #include <linux/etherdevice.h>
23 #include <linux/skbuff.h>
24 #include <linux/crc32.h>
25 #include <linux/ethtool.h>
26
27 #define DRV_NAME "rionet"
28 #define DRV_VERSION "0.2"
29 #define DRV_AUTHOR "Matt Porter <mporter@kernel.crashing.org>"
30 #define DRV_DESC "Ethernet over RapidIO"
31
32 MODULE_AUTHOR(DRV_AUTHOR);
33 MODULE_DESCRIPTION(DRV_DESC);
34 MODULE_LICENSE("GPL");
35
36 #define RIONET_DEFAULT_MSGLEVEL \
37 (NETIF_MSG_DRV | \
38 NETIF_MSG_LINK | \
39 NETIF_MSG_RX_ERR | \
40 NETIF_MSG_TX_ERR)
41
42 #define RIONET_DOORBELL_JOIN 0x1000
43 #define RIONET_DOORBELL_LEAVE 0x1001
44
45 #define RIONET_MAILBOX 0
46
47 #define RIONET_TX_RING_SIZE CONFIG_RIONET_TX_SIZE
48 #define RIONET_RX_RING_SIZE CONFIG_RIONET_RX_SIZE
49
50 static LIST_HEAD(rionet_peers);
51
52 struct rionet_private {
53 struct rio_mport *mport;
54 struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
55 struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
56 int rx_slot;
57 int tx_slot;
58 int tx_cnt;
59 int ack_slot;
60 spinlock_t lock;
61 spinlock_t tx_lock;
62 u32 msg_enable;
63 };
64
65 struct rionet_peer {
66 struct list_head node;
67 struct rio_dev *rdev;
68 struct resource *res;
69 };
70
71 static int rionet_check = 0;
72 static int rionet_capable = 1;
73
74 /*
75 * This is a fast lookup table for for translating TX
76 * Ethernet packets into a destination RIO device. It
77 * could be made into a hash table to save memory depending
78 * on system trade-offs.
79 */
80 static struct rio_dev *rionet_active[RIO_MAX_ROUTE_ENTRIES];
81
82 #define is_rionet_capable(pef, src_ops, dst_ops) \
83 ((pef & RIO_PEF_INB_MBOX) && \
84 (pef & RIO_PEF_INB_DOORBELL) && \
85 (src_ops & RIO_SRC_OPS_DOORBELL) && \
86 (dst_ops & RIO_DST_OPS_DOORBELL))
87 #define dev_rionet_capable(dev) \
88 is_rionet_capable(dev->pef, dev->src_ops, dev->dst_ops)
89
90 #define RIONET_MAC_MATCH(x) (*(u32 *)x == 0x00010001)
91 #define RIONET_GET_DESTID(x) (*(u16 *)(x + 4))
92
93 static int rionet_rx_clean(struct net_device *ndev)
94 {
95 int i;
96 int error = 0;
97 struct rionet_private *rnet = ndev->priv;
98 void *data;
99
100 i = rnet->rx_slot;
101
102 do {
103 if (!rnet->rx_skb[i])
104 continue;
105
106 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
107 break;
108
109 rnet->rx_skb[i]->data = data;
110 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
111 rnet->rx_skb[i]->protocol =
112 eth_type_trans(rnet->rx_skb[i], ndev);
113 error = netif_rx(rnet->rx_skb[i]);
114
115 if (error == NET_RX_DROP) {
116 ndev->stats.rx_dropped++;
117 } else if (error == NET_RX_BAD) {
118 if (netif_msg_rx_err(rnet))
119 printk(KERN_WARNING "%s: bad rx packet\n",
120 DRV_NAME);
121 ndev->stats.rx_errors++;
122 } else {
123 ndev->stats.rx_packets++;
124 ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
125 }
126
127 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
128
129 return i;
130 }
131
132 static void rionet_rx_fill(struct net_device *ndev, int end)
133 {
134 int i;
135 struct rionet_private *rnet = ndev->priv;
136
137 i = rnet->rx_slot;
138 do {
139 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
140
141 if (!rnet->rx_skb[i])
142 break;
143
144 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
145 rnet->rx_skb[i]->data);
146 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
147
148 rnet->rx_slot = i;
149 }
150
151 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
152 struct rio_dev *rdev)
153 {
154 struct rionet_private *rnet = ndev->priv;
155
156 rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
157 rnet->tx_skb[rnet->tx_slot] = skb;
158
159 ndev->stats.tx_packets++;
160 ndev->stats.tx_bytes += skb->len;
161
162 if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
163 netif_stop_queue(ndev);
164
165 ++rnet->tx_slot;
166 rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
167
168 if (netif_msg_tx_queued(rnet))
169 printk(KERN_INFO "%s: queued skb %8.8x len %8.8x\n", DRV_NAME,
170 (u32) skb, skb->len);
171
172 return 0;
173 }
174
175 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
176 {
177 int i;
178 struct rionet_private *rnet = ndev->priv;
179 struct ethhdr *eth = (struct ethhdr *)skb->data;
180 u16 destid;
181 unsigned long flags;
182
183 local_irq_save(flags);
184 if (!spin_trylock(&rnet->tx_lock)) {
185 local_irq_restore(flags);
186 return NETDEV_TX_LOCKED;
187 }
188
189 if ((rnet->tx_cnt + 1) > RIONET_TX_RING_SIZE) {
190 netif_stop_queue(ndev);
191 spin_unlock_irqrestore(&rnet->tx_lock, flags);
192 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
193 ndev->name);
194 return NETDEV_TX_BUSY;
195 }
196
197 if (eth->h_dest[0] & 0x01) {
198 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++)
199 if (rionet_active[i])
200 rionet_queue_tx_msg(skb, ndev,
201 rionet_active[i]);
202 } else if (RIONET_MAC_MATCH(eth->h_dest)) {
203 destid = RIONET_GET_DESTID(eth->h_dest);
204 if (rionet_active[destid])
205 rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
206 }
207
208 spin_unlock_irqrestore(&rnet->tx_lock, flags);
209
210 return 0;
211 }
212
213 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
214 u16 info)
215 {
216 struct net_device *ndev = dev_id;
217 struct rionet_private *rnet = ndev->priv;
218 struct rionet_peer *peer;
219
220 if (netif_msg_intr(rnet))
221 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
222 DRV_NAME, sid, tid, info);
223 if (info == RIONET_DOORBELL_JOIN) {
224 if (!rionet_active[sid]) {
225 list_for_each_entry(peer, &rionet_peers, node) {
226 if (peer->rdev->destid == sid)
227 rionet_active[sid] = peer->rdev;
228 }
229 rio_mport_send_doorbell(mport, sid,
230 RIONET_DOORBELL_JOIN);
231 }
232 } else if (info == RIONET_DOORBELL_LEAVE) {
233 rionet_active[sid] = NULL;
234 } else {
235 if (netif_msg_intr(rnet))
236 printk(KERN_WARNING "%s: unhandled doorbell\n",
237 DRV_NAME);
238 }
239 }
240
241 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
242 {
243 int n;
244 struct net_device *ndev = dev_id;
245 struct rionet_private *rnet = (struct rionet_private *)ndev->priv;
246
247 if (netif_msg_intr(rnet))
248 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
249 DRV_NAME, mbox, slot);
250
251 spin_lock(&rnet->lock);
252 if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
253 rionet_rx_fill(ndev, n);
254 spin_unlock(&rnet->lock);
255 }
256
257 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
258 {
259 struct net_device *ndev = dev_id;
260 struct rionet_private *rnet = ndev->priv;
261
262 spin_lock(&rnet->lock);
263
264 if (netif_msg_intr(rnet))
265 printk(KERN_INFO
266 "%s: outbound message event, mbox %d slot %d\n",
267 DRV_NAME, mbox, slot);
268
269 while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
270 /* dma unmap single */
271 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
272 rnet->tx_skb[rnet->ack_slot] = NULL;
273 ++rnet->ack_slot;
274 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
275 rnet->tx_cnt--;
276 }
277
278 if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
279 netif_wake_queue(ndev);
280
281 spin_unlock(&rnet->lock);
282 }
283
284 static int rionet_open(struct net_device *ndev)
285 {
286 int i, rc = 0;
287 struct rionet_peer *peer, *tmp;
288 u32 pwdcsr;
289 struct rionet_private *rnet = ndev->priv;
290
291 if (netif_msg_ifup(rnet))
292 printk(KERN_INFO "%s: open\n", DRV_NAME);
293
294 if ((rc = rio_request_inb_dbell(rnet->mport,
295 (void *)ndev,
296 RIONET_DOORBELL_JOIN,
297 RIONET_DOORBELL_LEAVE,
298 rionet_dbell_event)) < 0)
299 goto out;
300
301 if ((rc = rio_request_inb_mbox(rnet->mport,
302 (void *)ndev,
303 RIONET_MAILBOX,
304 RIONET_RX_RING_SIZE,
305 rionet_inb_msg_event)) < 0)
306 goto out;
307
308 if ((rc = rio_request_outb_mbox(rnet->mport,
309 (void *)ndev,
310 RIONET_MAILBOX,
311 RIONET_TX_RING_SIZE,
312 rionet_outb_msg_event)) < 0)
313 goto out;
314
315 /* Initialize inbound message ring */
316 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
317 rnet->rx_skb[i] = NULL;
318 rnet->rx_slot = 0;
319 rionet_rx_fill(ndev, 0);
320
321 rnet->tx_slot = 0;
322 rnet->tx_cnt = 0;
323 rnet->ack_slot = 0;
324
325 netif_carrier_on(ndev);
326 netif_start_queue(ndev);
327
328 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
329 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
330 RIONET_DOORBELL_JOIN,
331 RIONET_DOORBELL_LEAVE)))
332 {
333 printk(KERN_ERR "%s: error requesting doorbells\n",
334 DRV_NAME);
335 continue;
336 }
337
338 /*
339 * If device has initialized inbound doorbells,
340 * send a join message
341 */
342 rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
343 if (pwdcsr & RIO_DOORBELL_AVAIL)
344 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
345 }
346
347 out:
348 return rc;
349 }
350
351 static int rionet_close(struct net_device *ndev)
352 {
353 struct rionet_private *rnet = (struct rionet_private *)ndev->priv;
354 struct rionet_peer *peer, *tmp;
355 int i;
356
357 if (netif_msg_ifup(rnet))
358 printk(KERN_INFO "%s: close\n", DRV_NAME);
359
360 netif_stop_queue(ndev);
361 netif_carrier_off(ndev);
362
363 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
364 if (rnet->rx_skb[i])
365 kfree_skb(rnet->rx_skb[i]);
366
367 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
368 if (rionet_active[peer->rdev->destid]) {
369 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
370 rionet_active[peer->rdev->destid] = NULL;
371 }
372 rio_release_outb_dbell(peer->rdev, peer->res);
373 }
374
375 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
376 RIONET_DOORBELL_LEAVE);
377 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
378 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
379
380 return 0;
381 }
382
383 static void rionet_remove(struct rio_dev *rdev)
384 {
385 struct net_device *ndev = NULL;
386 struct rionet_peer *peer, *tmp;
387
388 unregister_netdev(ndev);
389 kfree(ndev);
390
391 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
392 list_del(&peer->node);
393 kfree(peer);
394 }
395 }
396
397 static void rionet_get_drvinfo(struct net_device *ndev,
398 struct ethtool_drvinfo *info)
399 {
400 struct rionet_private *rnet = ndev->priv;
401
402 strcpy(info->driver, DRV_NAME);
403 strcpy(info->version, DRV_VERSION);
404 strcpy(info->fw_version, "n/a");
405 strcpy(info->bus_info, rnet->mport->name);
406 }
407
408 static u32 rionet_get_msglevel(struct net_device *ndev)
409 {
410 struct rionet_private *rnet = ndev->priv;
411
412 return rnet->msg_enable;
413 }
414
415 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
416 {
417 struct rionet_private *rnet = ndev->priv;
418
419 rnet->msg_enable = value;
420 }
421
422 static const struct ethtool_ops rionet_ethtool_ops = {
423 .get_drvinfo = rionet_get_drvinfo,
424 .get_msglevel = rionet_get_msglevel,
425 .set_msglevel = rionet_set_msglevel,
426 .get_link = ethtool_op_get_link,
427 };
428
429 static int rionet_setup_netdev(struct rio_mport *mport)
430 {
431 int rc = 0;
432 struct net_device *ndev = NULL;
433 struct rionet_private *rnet;
434 u16 device_id;
435 DECLARE_MAC_BUF(mac);
436
437 /* Allocate our net_device structure */
438 ndev = alloc_etherdev(sizeof(struct rionet_private));
439 if (ndev == NULL) {
440 printk(KERN_INFO "%s: could not allocate ethernet device.\n",
441 DRV_NAME);
442 rc = -ENOMEM;
443 goto out;
444 }
445
446 /* Set up private area */
447 rnet = (struct rionet_private *)ndev->priv;
448 rnet->mport = mport;
449
450 /* Set the default MAC address */
451 device_id = rio_local_get_device_id(mport);
452 ndev->dev_addr[0] = 0x00;
453 ndev->dev_addr[1] = 0x01;
454 ndev->dev_addr[2] = 0x00;
455 ndev->dev_addr[3] = 0x01;
456 ndev->dev_addr[4] = device_id >> 8;
457 ndev->dev_addr[5] = device_id & 0xff;
458
459 /* Fill in the driver function table */
460 ndev->open = &rionet_open;
461 ndev->hard_start_xmit = &rionet_start_xmit;
462 ndev->stop = &rionet_close;
463 ndev->mtu = RIO_MAX_MSG_SIZE - 14;
464 ndev->features = NETIF_F_LLTX;
465 SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
466
467 spin_lock_init(&rnet->lock);
468 spin_lock_init(&rnet->tx_lock);
469
470 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
471
472 rc = register_netdev(ndev);
473 if (rc != 0)
474 goto out;
475
476 printk("%s: %s %s Version %s, MAC %s\n",
477 ndev->name,
478 DRV_NAME,
479 DRV_DESC,
480 DRV_VERSION,
481 print_mac(mac, ndev->dev_addr));
482
483 out:
484 return rc;
485 }
486
487 /*
488 * XXX Make multi-net safe
489 */
490 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
491 {
492 int rc = -ENODEV;
493 u32 lpef, lsrc_ops, ldst_ops;
494 struct rionet_peer *peer;
495
496 /* If local device is not rionet capable, give up quickly */
497 if (!rionet_capable)
498 goto out;
499
500 /*
501 * First time through, make sure local device is rionet
502 * capable, setup netdev, and set flags so this is skipped
503 * on later probes
504 */
505 if (!rionet_check) {
506 rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef);
507 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
508 &lsrc_ops);
509 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
510 &ldst_ops);
511 if (!is_rionet_capable(lpef, lsrc_ops, ldst_ops)) {
512 printk(KERN_ERR
513 "%s: local device is not network capable\n",
514 DRV_NAME);
515 rionet_check = 1;
516 rionet_capable = 0;
517 goto out;
518 }
519
520 rc = rionet_setup_netdev(rdev->net->hport);
521 rionet_check = 1;
522 }
523
524 /*
525 * If the remote device has mailbox/doorbell capabilities,
526 * add it to the peer list.
527 */
528 if (dev_rionet_capable(rdev)) {
529 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
530 rc = -ENOMEM;
531 goto out;
532 }
533 peer->rdev = rdev;
534 list_add_tail(&peer->node, &rionet_peers);
535 }
536
537 out:
538 return rc;
539 }
540
541 static struct rio_device_id rionet_id_table[] = {
542 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
543 };
544
545 static struct rio_driver rionet_driver = {
546 .name = "rionet",
547 .id_table = rionet_id_table,
548 .probe = rionet_probe,
549 .remove = rionet_remove,
550 };
551
552 static int __init rionet_init(void)
553 {
554 return rio_register_driver(&rionet_driver);
555 }
556
557 static void __exit rionet_exit(void)
558 {
559 rio_unregister_driver(&rionet_driver);
560 }
561
562 module_init(rionet_init);
563 module_exit(rionet_exit);
WRT350N Kernel Patches